Accession Number : AD0255808

Title :   DEVELOPMENT OF ULTRA REFRACTORY MATERIALS

Corporate Author : CARBORUNDUM CO NIAGARA FALLS N Y

Personal Author(s) : SHAFFER,PETER T.B.

Report Date : 28 APR 1961

Pagination or Media Count : 1

Abstract : Fundamental studies of the properties of solid solutions of ZrC and TaC were continued in an effort to explain certain anomalies such as the increased melting temperature and increased high temperature (above 3630 F) strength and creep resistance. It was decided to remeasure the melting temperatures. The melting point apparatus was checked for reproducibility of results by fusing several samples of refractory metal sheets, W, Ta, Mo, and Nb. The degree of precision and reproducibility of data indicated that sufficient accuracy should be obtainable in the melting point study of the ZrC-TaC system. Preliminary results were obtained on carbide bars heated directly by resistance. Apparent melting temperatures were measured on the bars up to the appearance of first droplets of liquid. A complete series of compositions is being prepared for melting temperature observations.

Descriptors :   *CARBIDES, *REFRACTORY MATERIALS, CRYSTAL LATTICES, ELECTRICAL PROPERTIES, HEAT TREATMENT, MEASUREMENT, MECHANICAL PROPERTIES, MELTING, PHASE STUDIES, TANTALUM COMPOUNDS, TEMPERATURE, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE